“a perpetual license to reproduce your words and name/web site in attribution”

From a purely grammatical view, that reads as if it gives you permission to scrape and republish the content of a commenter’s website. Yes, I know what it’s intended to mean, but some modification to the language might be for the best. Perhaps “name/URL” instead of “name/website”?

Alex is correct that this isn’t legally binding in any way. I doubt the issue would come up much in a nonprofessional blog, but if you have a professional website, check with an IP lawyer for what the wording should be.